My partner placed a #9 walnut in the gunks last weekend and it took me a good 5 minutes to get it out. It was placed in a horozontal crack with lots of little crystals. The little buckets on the walnut kept getting snagged on the crystals (which would be a good thing in a fall). I thought it was hopelessly stuck until I pulled some magic out of the air and managed to get it out.